Labradorescent plagioclase feldspar (Marcy Anorthosite, Mesoproterozoic, 1.16 Ga; Route 3 roadcut south of Bartlett Pond, New York State, USA) 3 : 無料・フリー素材/写真
Labradorescent plagioclase feldspar (Marcy Anorthosite, Mesoproterozoic, 1.16 Ga; Route 3 roadcut south of Bartlett Pond, New York State, USA) 3 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Labradorescent plagioclase feldspar crystal in anorthosite in the Precambrian of New York State, USA.Anorthosite is a coarsely-crystalline, intrusive igneous rock dominated by plagioclase feldspar. A major occurrence of this uncommon rock is in the Adirondack Mountains of New York State. In this area, the rocks have been regionally metamorphosed, but the overall mineralogy is the same.At this site, megacrystic anorthosite is present - plagioclase crystals are often quite sizable. Some float samples have garnet.Notice the iridescent blue crystal at center (click on the photo once or twice to zoom in) - that's labradorescent plagioclase feldspar, specifically the mineral labradorite. Geologic unit: Marcy Anorthosite, late Mesoproterozoic, 1.16 GaLocality: roadcut along the northern side of Route 3, south of Bartlett Pond, immediately east of the Bartlett Carry Road-Route 3 intersection, between the towns of Saranac Lake & Tupper Lake, central Adirondacks, southern Franklin County, northeastern New York State, USA (44° 14’ 49.95” North latitude, 74° 16’ 59.47” West longitude)--------------------------See info. at:en.wikipedia.org/wiki/Anorthosite |
| 撮影日 | 2012-05-13 12:04:07 |
| 撮影者 | James St. John |
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